In a preview for Sunday's (June 3) new episode, Nikki sits down and tells her family the sad news. Though the public has known about the break up for over a month now, it's still tough watching the WWE star explain her heartbreak to her family.

"I feel like such a huge piece is just missing from me," Nikki tearfully explains. "It's just weird, the first morning in six years not to talk to him, you know? ... Our life is one, that's what's so hard."

The ultimate reason why the couple broke up was Nikki's unwavering want to have a baby and John's adamant stance on not having kids, which is also addressed in the clip. "I just don't want him to be, like, lonely, and I don't want him to regret not being a dad, and that's what's sad because John feels like a brother, and I hate thinking in my head that he's going to be alone," Nikki's twin sister Brie says. "It makes me so sad."

Then, Nikki reveals the heartbreaking comment John made to her after they decided to call it quits.

"He sent me this text last night, and he goes, 'The day you become a mom and look at your baby, I'm expecting to get the first thank you text.' But it's like, I wanted him to be the father of my kids," she says, choking back tears. Watch the full clip below.